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For a quadratic trinomial of the form \(x^2+bx+c\), which condition is necessary and sufficient for it to be a perfect-square trinomial?

Answer and explanation

Correct answer: \(b^2=4c\)

A perfect square has the form \((x+p)^2=x^2+2px+p^2\). Thus \(b=2p\) and \(c=p^2\), giving \(b^2=4c\). Option \(b^2=c\) misses the factor 4. Exam tip: square the middle coefficient and compare it with \(4c\).

Related tags

Quadratic ExpressionsPerfect Square TrinomialAlgebraic IdentitiesDiscriminant ConditionClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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